Audition: Spectral more shortcuts not working in windows 10

Here I am providing the screenshot of the commands.
These keyboard shortcut commands worked well in Windows 8.1. But recently I upgraded to windows 10 and installed the same Adobe Audition 2015 cc which I was using before upgrade. Everything workes as usual but these commands shortcut:
Ctrl + Alt + up arrow
Ctrl + Alt + down arrow
These two keyboard shortcuts are not working.
First I thought Audition 2015 cc is not compatable with windows 10. So, I installed Adobe Audition 2019 CC but. It didn't work either.
I use keyboard shortcuts to work effeciently but this thing is really becomming desappointing. Please help.
